Filter.



No. 891,048. PATENTED JUNE 16, 1908.

P. J. DONOVAN.

FILTER.

APPLICATION rum) JUNE 14, 1901.

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No. 891,048. PATENTED JUNE 16, 1908.

I P. J. DONOVAN.

FILTER.

APPLICATION FILED JUNE 14, 1907,

3 SHEETS-SHEET 3.

animator with use:

. abmnugd PATRICK J. DONOVAN, or GRASS VALLEY, CALIFORNIA.

FILTER.

Specification of Letters Patent.

Patented June 18, 1908.

Application filed June 14, 1907. Serial No. 378,962.

To all whom it may concern:

Be it known that I, PATRICK J. DONOVAN, a citizen of the United States,residing at Grass Valley, in the county of Nevada, State of California,have invented certain new and useful Improvements in Filters; and I dohereby declare the following to be a full, clear, and. exactdescription. of the invention, such as Will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to filters and more particularly to that classdesigned. for use in metallurgy and the invention has for its object theprovision of a filter which will be efficient in operation and willoperate to completely separate values from the ore being treated.

The filter is designed principally for-use in the 'treatment of slimes,sands or sulfurets by the cyanid process in which process the values aredissolved, and in my filter are ob tained in this state by filtering thecyanid solution in which they are dissolved, from the mass from whichthey were separated.

The filter embodied in my invention is so constructed that the solutionin which the values are contained, may be filtered or drawn off eitherby compressed air or the creation of a vacuum, or both as conditions mayindicate most desirable.

In the accompanying drawings, Figure 1 is a front elevation of thefilter, Fig. 2 is a top plan view thereof, Fig. 3 is a verticallongitudinal sectional view, Fig. 4 is a vertical transverse sectionalview, Fig. 5 is an end clevation, and, Fig. 6 is a similar view but withthe near cylinder head removed.

In the drawings the filter is shown as comprising a drum which ismounted for rotation upon a shaft and the shaft which is indicated bythe numeral 10 is mounted for rotation. in suitable bearings 11 and heldagainst longitndinal movement in the bearing by means of collars 12which are fixed upon the shaft adjacent one end thereof and arepositioned one upon each side of one of the bearings. A pulley 13 isfixed upon. the shaft at the opposite end and serves as a means wherebythe shaft may be driven from any suitable motor or engine (not shown). I

The body of the drum mentioned above is indicated by the numeral 1.4 andis substantially cylindrical in form and closed at each of its ends byheads 15, one of the said heads being removable and being held in placewhen in position to close the corresponding end of the drum by means ofclamps 16 including each a pivoted portion 1.7 which maybe swung topermit removal of the head or, when the heads are to be clamped to thedrum, to position from reaching the edge of the periphery of the head,theclamp screw 18 being engaged through the said member 17 and. beingdesigned to bear against the head. In order that the connection betweenthe end of the drum and the head may be an air tight one, the said. endedges of the drum and the head are provided with annular grooves inwhich a packing ring or gasket 19 is received, the said ring being ofrubber or other suitable material which forms a connection of the classdescribed. The removable head 15 is of course provided centrally with anopening for the passage of the shaft 1.0 therethrough and a stuffing box20 is employed in connection with the removable head and the shaft toinsure an air tight connection between the shaft and the head.

A collar 21 is secured u on the shaft 10 directly outwardly of the fixedhead 15 by means of a set screw 22 and radiating from this collar arearms'23 which are secured at their outer ends to the corresponding endof the body 14 of the drum. A similar collar 24 is held. upon the shaftby means of a set screw 25 but this latter collar is located within thedrum and directly inwardly of the head 15 and arms 26 radiate from thiscollar 24 and are secured at their outer ends to a ring 27 which isfixed. inside of the drum at the said end and against which theremovable head 15 abuts when in place upon the drum, there being asimilar ring 28 fixed. at the op posite end. of the drum and inengagement with the fixed head at the said end.

Secured. to the inner periphery of the drum 14 and equidistantly spacedwith respect to each. other are strips 29 which extend longitudinally ofthe drum and from the ring 27 to the ring 28. These strips are providedin their outer edges with openings 80 so that liquid contained in thedrum may pass around the inside of the drum by passing through theopenings. A sheet 31 of canvas is secured to these strips 29 and at itsend edges to the rings 27 and 28 after having been drawn from the saidrings, it being understood that in this manner what may be termed acanvas drum is formed, the said drum being open at each end. Extendinginwardly in a radial direction. from each of the strips 29 is a pad dieor blade 32 the said paddle being held rigid by means of an anglebracket 33 one of W 'ch is secured to each paddle adjacent each endthereof and to a block 34 secured upon the inner periphery of the drumbody 14 at the corres onding end. These brackets 33 are preferab ylocated only at that end of the drum at which the removable head 15 islocated and the paddles are braced at their opposite ends from the fixedhead 15 at the opposite end of the drum. In each of the 1p; dles and atthat end thereof adjacent the ed head there is placed a valve 35 thestem 36 of which projects through a stuffing box 37 upon the said headwhereby the valves may be opened and closed from the outside of thedrum. The purpose of these valves will be presently explained, as willalso the function of the paddles which paddles by the way have theirinner edges terminated short of the shaft 10. A filling and dischargevalve 38 is arranged upon the drum and opens through the canvas 31therein so that material introduced into the drum through the valve willnot pass between the canvas and the drum body 14 but will be dischargeddirectly into the canvas cylinder heretofore referred to. A pipe 39 hascommunication at one of its ends with the drum at a point diametricallyopposite to the valve 38 and this pipe has its opposite end threadedinto the shaft 10 as indicated at 40, the said shaft being provided witha bore 41 which f as at 42 is one end of a pipe 43 which leads from thevacuum pump or other vacuum creating device (not shown).

A bore 44 is formed in the shaft 10 and opens through the end thereofopposite to t at end through which the bore 41 opens and this boreincludes a branch 45 which opens laterally through the shaft and intothe drum, there being a check valve 46. A pipe 47 connects with this endof the shaft 10 and leads to an air compressor (not shown).

A man hole 48 is provided in the removable head of the drum so that thedrum may be flushed when necessary.

The operation of the filter is as follows:

- The slimes, sands or sulfurets to be treated to dissolve as stated,the vacuum creating air is forced into the canvas "drum at the same timeit is drawn out of the space between the drum body 14 and the canvasdrum.

It will be understood that the drum is rotated continuously during theseseveral operations so that the slimes, sands or sulfurets will not cakein one place but will be evenly divided. When all of the solution hasbeen extracted the drum is stopped and flushed and the rocess repeated.It will be obvious that uring the time of rotation of the drum, theslimes, sands or sulfurets will 'be carried up by the paddles 32 andwill fall therefrom and in this manner be thorstruction herein shown anddescribed as ob- J vious modifications will occur to those skilled inthe art.

What-is claimed is 1. An apparatus of the class described comprising ashaft, a drum fixed upon the shaft for rotation therewith, a filteringdrum disposed concentrically within the first mentioned drum in spacedrelation with respect thereto, the shaft being formed with an air inletpassage which opens into the filtering drum and being also formed withan air outlet passage, and a pipe communicating with the air outletpassage at one end and opening at its other end into the interspacebetween the drums.

2. An apparatus of the class described comprising a drum mounted forrotation, a filtering drum disposed concentrically within the firstmentioned drum and having its wall spaced with respect thereto, paddlesdisposed radially within the first mentioned drum and extending into thefiltering drum, said addles having their outer edges dispose against theinner face of the wall of the 11st mentioned drum except at points wheresaid paddles are recessed in their said edges, and means whereby avacuum or plenum may be induced in the drum.

3. An apparatus of the class described comprising a drum mounted forrotation, a filtering drum disposed concentrically within the firstmentioned drum and having its means whereby air may be forced into thewalls in spaced relation with respect to the filtering drum. I 10 wallsof the first mentioned drum, paddles In testimony whereof, I affix mysignature, disposed radially within the filtering drum, in presence oftwo Witnesses.

valves located upon the paddles and oper- PATRICK J. DONOVAN. able fromwithout the drum, means whereby Witnesses: air may be exhausted from theinterspace D. T. DONOVAN,

between the walls of the two drums, and P. J. RILEY.

